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Caller ID Port

I have an ethernet connection from ONT to my server/router and then from my private network a connection to WAN on the Actiontec mi424wr router supplied.  I need to know the ports and protocol (TCP?) caller id is using so I can pass messages through my router and forward the ports the the LAN on the Actiontec.  All other services are working except Caller ID which I believe is the only service requiring an incoming connection.  I'm not asking for a fix to my problem but I am asking for technical details so I can fix my own problem.  Thanks in advance for your assistance.

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Re: Caller ID Port
Master - Level 2

Have you ever had Caller ID working?  Did you enable it?  Has it ever worked if the VZ router is connected as the first router?